Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4zmhA 5y39D 5y39E 4zmhA 100 15 28 5y39D 37 100 38 5y39E 23 38 100 FOLD SIMILARITY (Z-SCORE) 4zmhA 5y39D 5y39E 4zmhA 64.1 0 0 5y39D 0 21.3 11.3 5y39E 0 11.3 21.1